Improvement in machines for making cores



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G. GOWING. Machine for Making Cores.

Patented Nov. 5,1878.

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G GOWING Machine for Making Gprest Patented Nov. 5, I878.

WITNESSES MMM 4% INVENTOR fl &u c wcw ATTORNEYS UNITED STATES PATENTFFIGE.

GEORGE OOWING, OF CLEVELAND, OHIO.

IMPROVEMENT lN MACHINES FOR MAKING CORES.

Specification forming part of Letters Patent No. 209,551, dated November5, 1878; application filed January 12, 1878.

To all whom it may concern:

Be it known that I, GEORGE OOW'ING, of Cleveland, in the county ofOuyahoga and State of Ohio, have invented certain new and usefulImprovements in Machinery for Making Cores; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it pertains tomake and use it, reference being had to the accompanying drawings, whichform part of this specification.

My invention relates to machineryfor making cores for employment for thepurpose of making a continuous screw-thread on the interior of apipe-joint or coupling in the process of casting, though equallyapplicable in all cases where it is desirable to produce an interior orfemale thread in casting, as, for instance, in the pipe-openings ofsteam-radiator bases, and in all kinds of steam, water, gas, and otherpipe fittings;

The invention consists in the combination, with a stationarycore-supporter and tubular shaft adapted to revolve about the same invertical adjustment, and provided with a coreforming flask, of asectional mold formed above the same, the sections of said mold beinghinged together and provided with a suitable locking device.

The invention further consists in a shelving or inclined shield formedon the top of the machine and adapted to cover and protect the workingparts thereof.

In the drawings, Figure 1 is a sectional view of a machine embodying myinvention. Fig. 2 is a separate view of a core and coreprint formed bymy said machine. Fig. 3 is plan view of my machine.

A is a suitable frame-work for supporting the mechanism. It may be ofany desired form, though I prefer that it shall be a single casting,since it simplifies and cheapens the construction, while at the sametime it insures rigidity and a proper adjustment at all times of theworking parts.

B is a tubular shaft, the upper end of which is provided withascrew-tapped head or female 'screw,B which serves as the flask orformer,

within which the sand or other core material is packed or rammed, andwhich serves as the pattern for the thread that is to be formed upon thecore. This shaftB is threaded atB' onits exterior and tapped at thispoint through a stationarynut or bearing, 0. At another point, B theshaft passes through a gear- Wheel, and is connected therewith looselyby a feather, D, and groove (1, so that as the shaft is turned or drivenby means of the gears B and E and the power F the shaft may rise or fallthrough the medium of the nut 13 and slide freely by the feather andgroove through the gear B.

G is a central stem or support within the tubular shaft B. It rises soas to support the core H that is being formed. It is provided also,preferably, with a recess, G for accommodating and holding in proper,position a core-arbor, if one is employed.

Gr is a plate, preferably of iron or steel, which is secured to the topof the central support 6-, and having a spiral edge which fits into thebottom of the thread B in the shaft B. This plate serves the purpose ofso supporting the end of the thread which is to correspond with theinner end of the thread in the finished casting as to prevent it frombeing broken or injured as the pattern or shaft B is run down orunscrewed therefrom.

I is a two-leaved hinged flask or pattern, which, when closed about theupper end B of the shaft B, forms the cavity in which the core print H,formed in one piece continuous with the screw -core H, is fashioned.This core print H and its hinged mold I also serve another veryimportant object, for it is apparent that if no core-print was thusformed to extend beyond the threaded core H the upper end of the threadcorresponding with the entrance of the thread in the finished castingwould be almost sure to be injured and damaged to such an extent inrunning off the screwshaft B from the core as to require that thefinished casting should be cut and dressed before its thread could beused. But while the hinged mold I serves to hold the core againstturning with the shaft B, it also protects, the core-print right down toedge of the screwcore, and the upper thread is then, in turn,supportedand protected by the core-print, and

is thus formed perfectly, so as to make in the finished casting a threadwhich is at once ready for use.

The mold or flask I may be opened about a hinge, i, and when closed maybe clamped by a suitable device, I.

J isa conical or shelving shield,which serves to cover the workingparts, and, inasmuch as it extends up to the end of the shaft B, allsand, &c., that may fall over the side in the operation of filling andramming is deflected ofi out of the way.

The operation is apparent: The mold I is closed upon the end of theshaft B, and, if a core-bar, K, is to be used, it is inserted into theopening G in the end of the support Gr. The sand or mold ingredients arethen introduced and rammed snugly down into the cavity formed around thebar K. When sufficiently rammed, the operator, by turning the crank F,runs the shaft B down, at the same time unscrewing it from the sand-coreH. The plate Gr prevents the lower thread from being broken or damaged,while the core-print and the mold 1 prevent the upper threads frominjury. The clamp I is then released and the mold I is opened, thusfreeing the core and core-print, after which it may be baked to hardenit.

The core -print is shown as cylindrical, though it may be made of anydesired sectional formas square, oval, or polygonal.

These screw-threaded cores may be readily secured by dowels orotherwise, or' by the dowel ends of their cores, to plain portions ofcores that correspond with the interior unthreaded portions of any kindof water, gas, or steam joints or fittings, and may be employed in likemanner wherever female threads are to be formed in castings, as, forinstance, in the bases of steam-radiators and other like localities.

What I claim is- 1. The combination, with the stationary core-supporterand tubular shaft adapted to revolve about the same in verticaladjustment, and provided with a'core-formin g flask, of the sectionalmold formed above the same, the sections of said mold being hingedtogether and provided with a suitable locking device, substantially asset forth.

2. I11 a machine for making cores, the shelving or inclined shield J,substantially as set forth. i

3. The supporting-plate, mounted on the central stem, and of largerdiameter than the stem, and having a spiral edge fitting into the'bottom of thread B, as and for the purpose set forth.

In testimony whereof I have signed my name to this specification in thepresence 0 two subscribing witnesses. GEORGE COWING. Witnesses:

F. ToUMEY, W. E. DONNELLY.

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